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  <title>Constructs a new fixed array</title>
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    <li>Constructs a new fixed array</li>
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  <div id="layout-content"><div id="splfixedarray.construct" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SplFixedArray::__construct</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">SplFixedArray::__construct</span> &mdash; <span class="dc-title">Constructs a new fixed array</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-splfixedarray.construct-description">
  <h3 class="title">说明</h3>
  <div class="constructorsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SplFixedArray::__construct</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$size</code><span class="initializer"> = 0</span></span>)</div>

  <p class="para rdfs-comment">
   Initializes a fixed array with a number of <strong><code>null</code></strong> values equal to <code class="parameter">size</code>.
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-splfixedarray.construct-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">size</code></dt>

     <dd>

      <p class="para">
       The size of the fixed array. 
       This expects a number between <code class="literal">0</code> and <strong><code>PHP_INT_MAX</code></strong>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-splfixedarray.construct-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   Throws a <span class="classname"><a href="class.valueerror.html" class="classname">ValueError</a></span> when <code class="parameter">size</code>
   is a negative integer.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-splfixedarray.construct-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>8.0.0</td>
       <td>
        Now throws a <span class="classname"><a href="class.valueerror.html" class="classname">ValueError</a></span> if
        <code class="parameter">size</code> is a negative;
        previously it threw a <span class="classname"><a href="class.invalidargumentexception.html" class="classname">InvalidArgumentException</a></span>.
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-splfixedarray.construct-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3546">
    <p><strong>示例 #1 <span class="function"><strong>SplFixedArray::__construct()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$array&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplFixedArray</span><span style="color: #007700">(</span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$array</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$array</span><span style="color: #007700">[</span><span style="color: #0000BB">4</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #DD0000">"foo"</span><span style="color: #007700">;<br /><br />foreach(</span><span style="color: #0000BB">$array&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$v</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;</span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$v</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
NULL
int(2)
NULL
NULL
string(3) &quot;foo&quot;
</pre></div>
    </div>
   </div>
  </p>
 </div>

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